Alfred mil ward reynolds and john thomas hewitt



No. 6|6,357. Patented Dec. 20', |898.

A. M. REYNOLDS & J. T. HEWITT.

MANUFAGTURE 0F TUBES.

(Application led Hay 26, 1898.) (N o M u d e l AUNTTED STATES PATENT OFFICE.

ALFRED nILwARD REYNOLDS AND JOHN THOMAS HEwrr'r, OF BIEMING- HAM, ENGLAND.

SPECIFICATION forming part of Letters Patent No. 616,357, dated December 20, 1898.

Application ilecl May 26,1898. Serial No. 681,833. (No model.)

To /LZZ mito/n, it 1m/.y concern:

Be it known that we, ALFRED MILWARD REYNOLDS and JOHN THOMAS HEWITT, subjects of the Queen of Great Britain and Ire- 5 land, and residents of Newtown Row, in the city of Birmingham, England, have invented certain new and useful Improvements Relating to the Manufacture of Tubes, (for which we have led an application for patent in xo Great Britain, No. 24,931, bearing date October 27, 1807,) of which the following is a specification.

This invention consists of improvements relating to the manufacture of seamless steel tubes for boilers, for cycle construction, and for other purposes, our object being to readily produce such tubes with a varying distribution of metal or with the ends or other required parts of a greater thickness than the 2o body of the tubes.

f In the accompanying sheet of explanatory drawings, to be hereinafter referred to, Figure l is a longitudinal section through the tube prior to drawing. Fig. 2 is a side elevation of the sleeve or nut. Fig. 3 is a View, partly7 in section, of screwed stem attachment; and Fig. -i is an end View of the same. Fig. 5 is a side view of the mandrel. Fig. 6 is a sectional view of the tube on the mandrel after 3o ithas been passed throughadie. Fig. 7 4shows the tube after the removal of the mandrel. Fig. S shows the completed double-butted tube having the internally-projecting flange cut away. Figs. 9, l0, and 1l are views illus- 3 5 trating the drawing of tubes tapering toward both ends. Figs. l2 and 13 are views illustratin g the drawing of tubes tapering continuously toward one end.

Referring to Figs. l to S, illustrating the manufacture of a tube with an additional thickness of metal at each end, but with a parallel or uniform bore or internal diameter, we first draw the tube in any ordinary manner to a suitable length and thickness for the production of the finished tube, as shown in Fig. l. .Ve then place this tube A upon a mandrel F, which is necked down or reduced at l), corresponding with the required thickened portion of the tube at one end.

In order -to avoid waste of metal by nosing or closing the end of each tube to form the grip end A preparatory to drawing, more particularly when making short tubes for cycle construction and other purposes, We use a screwed stem, as D, having a head or collar, which tits loosely in the tube and bears against an internal flange, as A2, formed on the end of the tube A, Figs. l, 6, yand 7. A sleeve or nut E, Figs. 2, 6, and 7, is screwed onto the externally-projecting portion of the 6o stem D and grips the flanged end A2 Of the tube against the head of the stem D, as illustrated at Figs. 6 and 7. The stem is prevented from turning,while the sleeve is screwed onto it by the interlocking or engagement of its inner portion with the square end Fof the mandrel F.

The removal of the tube from the mandrel is effected by holding back the tube by means of a retaining-piece engaging with the groove 7o e of the sleeve E, the mandrel being drawn out by the engagement of the moving or sliding part of the ordinary tube-drawing machine with the groove f, or the mandrel may be held back while the tube is withdrawn from it.

We manufacture tubes having a tapering thickness of metal and the maximum at the center or midway between the ends from tubes of uniform thickness, which we draw down 8o upon a mandrel G, Fig. 9, which is tapered to correspond with the required taperin the tube metal. One end of the tube has an int-ernally-projecting iiange formed upon it, as shown, to permit of its attachment with a screwed stem and a sleeve or nut such as hereinbefore described. After the tube has been released from the mandrel by the action of an ordinary reeling or releasing machine the mandrel is removed from it, as with the 9o tubes having thickened or butted ends, as hereinbefore described, and thus a tube is produced,as shown atFig. lO,havinga thickened central portion and with a uniform bore or internal diameter. If the tube is required to be of uniform external diam eter, it is passed through a die with a loosely-fitting mandrel. After removal of the screwed stem and the sleeve or nut the internally-projecting flange is cut away, leaving the finished tube, as roo sh'own`at Fig. 1l.

XVe manufacture tubes having a tapering thickness, but with the maximum at one end, from tubes having a parallel thickness of metal by drawing such tubes on a suitablytapered mandrel, as H at Fig. l2. Fig. 13 represents the finished tube with a uniform external diameter after the removal of the mandrel H and the cutting away of the internally-projecting flange by which the tube was held during its pass through the die. XVe sometimes provide the mandrel H With the screwed stem for passing through the flanged end formed in one piece with the said mandrel. be connected in any other manner than by screwing.

Having now described our invention, what We claim as new, and desire to secure by Letters Patent, is-

An apparatus for drawing tubes having butted ends 01' a varying thickness of metal and having an internally-hanged end, com- The sleeve and stem may, if desired,

prising a stem D havinga head fitting loosely in the tube and abutting against said internal fiange, a sleeve E detaehably` secured on- ALFRED MILWARD REYNOLDS. JOHN THOMAS HEWITT.

Witnesses:

EDWARD MARKS, HERBERT BOWKETT. 

